Connected: An Internet Encyclopedia
RFC 1035 - 3.2.4. CLASS values

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### 3.2.4. CLASS values

CLASS fields appear in resource records. The following CLASS mnemonics and values are defined:

IN | 1 the Internet
CS | 2 the CSNET class (Obsolete - used only for examples in some obsolete RFCs)
CH | 3 the CHAOS class
HS | 4 Hesiod [Dyer 87]

Next: 3.2.5. QCLASS values

Connected: An Internet Encyclopedia
RFC 1035 - 3.2.4. CLASS values